Stop-motion for looms for weaving elastic webbing



(No Model. i

B.A. MANN.

STOP MOTION FOR LOOMS FOR WEAVING BLASTIG'WEBBING. No. 288,462. Patented Nov. 13, 1-883.

N. PETERS. FnoXo-Luilmgnphen w hhgm l). C.

' UNITE STATES PATENT OFFICE.

BELAA. MANN, or HAMDEN, CONNECTICUT.

"STOP-MOTION FOR LOOMS FOR WEAVING ELASTIC WEBBHNG.

SPECIFICATION forming part of Letters Patent No. 288,462, dated November 13,1883.

Application filed March 7, 1883. (No model.)

To all whom it may concern: I

Be it known that I, BELAA, MANN, of Hamden. in the county of New Haven and State of Connecticut, have invented a new Stop- Motion for Looms for WVeaving Elastic W'eb hing, and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1,a sectional top VlEW of so much of the loom as illustrates the invention; Fig. 2,

a longitudinal vertical section of the same; Fig. 3, an end view; Fig. 4, a transverse section through the reciprocating bar F, the trough and aportion of the frame enlarged Fig. 5, a diagram illustrating the movement of the arm P. r This invention is an improvement in stopmotions for looms for weaving elastic webbing.

In .the manufacture of elastic webbing the indi'a-rubber threads are introduced under tension parallel with the warps, the weaving proceeding in the usual manner of weaving webbing, except that thebeating up may be somewhat lighter. Then, as the webbing is delivered, the elastic threads contract, drawing the filling hard together, and so that the required elasticity is given to the strip. In weaving this class of webbing a serious difficulty is experienced. Necessarilya thread of india-rubber is arranged at the selvage edge of the webbing, and as the filling-thread is constantly drawn first over one side and then over the other it frequently breaks one of the outside india-rubber threads, and when that thread is so broken it reacts and flies back onto its spool and away from the point where it is broken. The weaving, however, will continue to all appearances the same as if the indiarubber thread was present, and cannot readily be discovered until after the weaving has continued for a considerable distance, or until the point at which the break occurs reaches that point where the tension is applied to draw the webbing forward. Then it is indicated by the appearance of the edge of the webbing where the break occurred, as when the elastic thread is perfect the edge will be straight and flat like the whole surface of the webbing; but in case of a break, so soon as the tension is removed that edge where the break occurred will full up and not lie flat, as in perfect work. This discovery,then, of the break is not liable to be made until from half to three-quarters of a yard has been woven, and as this half or three-quarters of a yard is defective, it must be cut and goes to waste. This hitherto unavoidablewaste adds materially to the cost of manufacture of elastic webbing. Another loss arising from this same difficulty occurs from the out which is made in the strip to take out the defective part. This webbing is used very largely, or almost entirely, for suspenders which require a given length, and if in apiece, say, of twenty-four yards there are cuts to remove the defective portion, there is a waste at each out, unless perchance the out should occur where the strip would be cut in the usual cutting-up operation.

i The object of my invention is to avoid these difficulties and indicate the break upon the instant it occurs, so that the operator may at once unite the broken elastic threads, and save all lost, waste, or defect usually arising from the breaking of the selvage elastic threads; and it consists in mechanism between loom as will be necessary for the illustration of my invention, it being understood that the loom itself is the common webbing loom, usually arranged to weave twelve independent strips, more orless.

A represents the lay; B the crank-shaft, through which, by connecting rods 0, the swinging movement is imparted to the lay. The shaft B is here represented as driven by power applied to a shaft, D, at right angles to the shaft B, and communicating with the shaft by bevel-gears a. On the shaft Dis a tight pulley, b, and a loose pulley, d.

' e is a belt-shipper in the usual relation to the pulleys, and so that by its movement back- ICO ward or forward it will correspondingly transfer the belt from the loose to the tight pulley, and vice versa.

E represents the spool from which the elastic threads are drawn, they being held under tension, as usual. f represents the thread at one selvage, and h at the opposite. Below these threads, and at the rear of the frame, a horizontal sliding bar, F, is arranged, and guided for longitudinal movement preferably in a trough, tube, or box, H. A horizontal reciprocating movement is imparted to this bar F by means of a cam, I, on the shaft 13. This cam, as shown .in Figs. 1 and 2, has a spiral rib which works in a corresponding notch in the vertical lever L, hung below, and so that each rotation of the shaft B imparts a complete vibration to the lever L, as indicated in broken lines, Fig. 2, this being a wellknown device to convert rotary into reciprocating movement; or other known means may be employed for turning the lever L to the right and left. On one side of the lever L is a spring, t, and on the opposite side a corresponding spring, Z. These springs extend up and bear each upon a stud, m, on the bar F, and so that the power of the vibrating lever L is imparted to the bar F through the said springs t 1, according to the direction in which the lever L swings, the springs being of sufficient power to move the bar F in its guides when free, so that a full reciprocating movement is imparted to the bar F at each rotation of the shaft l3that is, at each beat of the lay.

s s are drop-pins, each formed with an eye, it. They are arranged in suitable guides, (represented in the illustration as holes through thetopof the box or trough H,) and so that the edge or selvage elastic threads will run through the eyes, as seen in Figs. 1 and 4.

These pins, when the elastic threads are per-- fect, stand over the projections n, as seen in Fig. 4., and so that they do not interfere with the reciprocating movement of the bar F 5 but should one of the edge elastic threads break its pin will instantly fall into a recess, 0, between the projections n, and arrest the movement of the bar F. \Vhen that bar is so arrested, the vibrating lever L will continue its movement; but the spring 6 or Z, according to the direction in which the lever L is moving, will yield so as not to interfere with such positive movement of the lever L. At the end of the loom where the power is applied the bar F extends outward, as seen in Figs. 1 and 2. In connection with the lay is a horizontal arm, P. This arm is hinged to the lay, so that while it moves with it in a horizontal plane it is free for vibration on its hinging point a in that same plane. The bar F carries a loop, It, or is otherwise connected to the arm P, so that it will impart to the rear end of that arm a horizontal swinging movement corresponding to the movement of the bar F, as indicated in Fig. 5.

The shipper iscarried by a horizontal bar, w, lying beneath the arm P, as seen in Fig. 3.

On this bar to is an upwardly-projecting stud, 3, which stands in the horizontal path of the arm P, sothat if the arm P moves directly rearward it will strikethe stud 3 on the shipper-bar and force that shipper rearward to throw the belt from the tight pulley 12 onto the loose pulley d; but to prevent such contact of the arm P with the stud the vibratory movement before described is imparted to it. Near the end of the arm P, on its under side, a transverse notch, 4, is out, (see Fig. 3,) and so that as the arm P moves rearward with the lay, operated by the longitudinal movement of the bar F, it passes to the right of the pin, as seen inbrokenlines, Fig. 5. Then as the bar F moves to the left it will carry the arm'P across to the opposite side, the notch 4' passing over the stud 3. Thus, when properly working, the arm P will work in its reciprocating vibratory path and escape the stud; but should one of the elastic threads break and stop the reciprocation of the bar, as before described, that stop occurs midway between the extremes of the movement of the bar, and

hence will prevent the vibratory movement of the arm P, leaving it only freefor reciprocating movement. Then in the next rear movement of the arm P it will strike the stud 3 on the shipper-bar, as seen in broken lines, Fig. 3, and force the shipper-bar rearward to throw the belt onto the loose pulley, and when this is done the loom stops, and as the stop is made when the thread breaks it follows that only a single beat can occur after the break of the thread. This sudden stop enables the tender to take up the broken elastic thread, reengage it, and then start the loom, when the work will proceed, as before, and leave no indication that such a break has occurred.-

I have represented the bar F as provided with projections n and intermediate notches or recesses, r,'by means of which the drop-pins will engage and arrest the bar; but the bar maybe otherwise constructed, it onlybeingessential that the bar shall have a reciprocating movement in a path at right angles to the warp threads and be provided with stops with which the drop-pins will engage, sothat when the drop-pins fall they will arrest the reciprocating movement and cause the power to be disengaged by such stoppage of the reciprocating movement of the bar. I therefore do not wish to be understood as limiting myself to the precise construction of the parts.

What I claim is- The combination of the drop-pins S, adapted to be supported by the elastic threads, and the bar F, and means for reciprocating the same at right angles to the threads, said bar being constructed with recesses r, with the lay, the arm P in connection therewith, said arm Pbeing also hung to the bar F, the shipper-bar 10;

provided with. a stud, 3, and mechanismfor operating the lay, substantially as described. Witnesses: BELA A. MANN.

J OHN E. EARLE, J os. O. EARLE. 

